• In advanced theoretical physics, a modulus is a scalar field with no potential energy. See moduli.
• In materials science, modulus (or elastic modulus) is a measure of the stiffness of a material. See also Young's modulus
• In mathematics, the modulus of a number (real or complex) is its absolute value. The modulus of a vector is its length.
• The word modulus also denotes the number by which two numbers are said to be congruent in modular arithmetic.
• The word modulo, which is the Latin ablative of modulus, has many meanings (all somewhat related) in mathematics and computing. See modulo.
• Another mathematical sense is the modulus of continuity.